... B,C and D. It possesses the network elements timing function of ITU-T G.813 recommendation, and 14× ... NMS).FeaturesWorld leading design adopts independent ASICs, with 1U single-board structure, compactness, high reliability, low power consumption; ... G.813 recommendation, provides timing synchronous interface, implements switching of multiple timing sources, supports SSM function;The SEC supports Tracing ...